body {
    background-color: #eee;
}

.form-signin {
    position: absolute;
    width: 330px;
    padding: 15px;
    top: calc(50% - 70px);
    left: 50%;
    transform: translate(-50%, -50%);
}
.container {
    position: relative;
    min-height: calc(100vh - 90px);
}
.form-margin-top {
     margin-top: 50px;
}
.form-signin .form-signin-heading,
.form-signin .checkbox {
    margin-bottom: 10px;
}
.form-signin .checkbox {
    font-weight: normal;
}
.form-signin .form-control {
    position: relative;
    height: auto;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    padding: 10px;
    font-size: 16px;
    margin-bottom: 10px;
}
.form-signin .form-control:focus {
    z-index: 2;
}
.form-signin input[type="email"] {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}
.form-signin input[type="password"] {
    margin-bottom: 10px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}
footer{
    margin-bottom: 20px;
    text-align: center;
    height: 70px;
}